Articles by Author: H Winker

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  1. Optimal BRUVs (baited remote underwater video system) survey design for reef fish monitoring in the Stilbaai Marine Protected Area

    Optimal BRUVs (baited remote underwater video system) survey design for reef fish monitoring in the Stilbaai Marine Protected Area

    Item type: Journal Article • Journal: African Journal of Marine Science
    Marine protected areas (MPAs) play an important role in coastal conservation, but there is presently no uniformly applied methodology for monitoring the efficacy of coastal fish protection. Whereas underwater visual census and controlled angling surveys have been used, their skilled-labour...
  2. Selected fishery and population parameters of eight shore-angling species in the Tsitsikamma National Park no-take marine reserve

    Selected fishery and population parameters of eight shore-angling species in the Tsitsikamma National Park no-take marine reserve

    Item type: Journal Article • Journal: African Journal of Marine Science
    An eight-year research angling dataset collected between February 1998 and December 2005 in the Tsitsikamma National Park marine protected area (MPA), along the south-eastern Cape coast of South Africa, was examined to provide estimates of important fishery and population parameters...
  3. Life history strategy and population characteristics of an unexploited riverine cyprinid, <em>Labeo capensis</em>, in the largest impoundment in the Orange River Basin

    Life history strategy and population characteristics of an unexploited riverine cyprinid, <em>Labeo capensis</em>, in the largest impoundment in the Orange River Basin

    Item type: Journal Article • Journal: African Zoology
    The life history of an endemic riverine African cyprinid, Labeo capensis, that dominates the larger ichthyofauna in a large impoundment in the Orange River Basin four decades after damming, was investigated. Both sexes grew at a similar rate until the...
  4. Life-history characteristics of an age-validated established invasive African sharptooth catfish, <em>Clarias gariepinus</em>, population in a warm–temperate African impoundment

    Life-history characteristics of an age-validated established invasive African sharptooth catfish, <em>Clarias gariepinus</em>, population in a warm–temperate African impoundment

    Item type: Journal Article • Journal: African Zoology
    It has been suggested that the invasive, omnivorous Clarias garipienus is capable of rapid invasions and long-term persistence in recently inhabited freshwater systems. To test this hypothesis, the life history of the established, extralimital Darlington Dam (33°10’31”S, 25°09’13”E) population was...
  5. Validation of growth zone deposition in otoliths of two large endemic cyprinids in Lake Gariep, South Africa

    Validation of growth zone deposition in otoliths of two large endemic cyprinids in Lake Gariep, South Africa

    Item type: Journal Article • Journal: African Zoology
    We tested the hypothesis that growth zones in the astericus otoliths of smallmouth yellowfish (Labeobarbus aeneus) and Orange River mudfish (Labeo capensis) were deposited annually. Two methods, fluorochrome marking and edge analysis of otoliths were used. For fluorochrome marking, specimens...
  6. First survey of fishes in the Betty's Bay Marine Protected Area along South Africa's temperate south-west coast

    First survey of fishes in the Betty's Bay Marine Protected Area along South Africa's temperate south-west coast

    Item type: Journal Article • Journal: African Journal of Marine Science
    This first survey of fish in the Betty's Bay Marine Protected Area (MPA), on the south coast of South Africa, was conducted using baited remote underwater video systems (BRUVs). A total of 58 deployments recorded 42 species in 20 km2, including...
  7. Sharks caught in the KwaZulu-Natal bather protection programme, South Africa. 13. The tiger shark <em>Galeocerdo cuvier</em>

    Sharks caught in the KwaZulu-Natal bather protection programme, South Africa. 13. The tiger shark <em>Galeocerdo cuvier</em>

    Item type: Journal Article • Journal: African Journal of Marine Science
    The current study provides long-term catch rate and biological data for tiger sharks Galeocerdo cuvier caught in the KwaZulu-Natal bather protection programme. Between 1978 and 2014, 1 760 G. cuvier were caught in nets and between 2007 and 2014, 108...
  8. Dark times for dageraad <em>Chrysoblephus cristiceps</em>: evidence for stock collapse

    Dark times for dageraad <em>Chrysoblephus cristiceps</em>: evidence for stock collapse

    Item type: Journal Article • Journal: African Journal of Marine Science
    The declaration of a state of emergency in the South African linefishery in 2000 has had a positive impact on a few overexploited endemic seabreams (Family Sparidae). However, the population of the reef-dwelling dageraad Chrysoblephus cristiceps has been unresponsive to...
  9. Monitoring the recovery of a previously exploited surf-zone fish community in the St Lucia Marine Reserve, South Africa, using a no-take sanctuary area as a benchmark

    Monitoring the recovery of a previously exploited surf-zone fish community in the St Lucia Marine Reserve, South Africa, using a no-take sanctuary area as a benchmark

    Item type: Journal Article • Journal: African Journal of Marine Science
    Limiting accessibility to a fishing area can reduce fishing effort effectively and may therefore promote local recovery of depleted stocks. In January 2002, beach driving was banned in South Africa, thereby reducing angler access to large areas of the coastline,...
  10. When plenty is not enough: an assessment of the white stumpnose (<em>Rhabdosargus globiceps</em>) fishery of Saldanha Bay, South Africa

    When plenty is not enough: an assessment of the white stumpnose (<em>Rhabdosargus globiceps</em>) fishery of Saldanha Bay, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    White stumpnose Rhabdosargus globiceps is the main target of the linefishery in Saldanha Bay. Increased fishing pressure over the last three decades, particularly by the recreational sector, has led to concerns regarding sustainability of the local white stumpnose stock. The...